Newbie: How to detect end of replay in an app?

[Amadan]

I figured out I can detect the start of the replay when status flips from AC_OFF to AC_REPLAY; but when the replay is finished, the game just hangs out in the pit, not exiting. How would I detect this state? (I am running through Content Manager, if relevant.)

Supplemental question (not critical): Through analogy and experimentation I figured out that I can shut down the game by sending 66 (i.e. \x42\x00\x00\x00) to UDP 9666. Is that a proper way to shut down the game programmatically? Is there a description of this UDP 9666 API?

(First post here - not sure I posted in the right place, please forgive me if so.)